* Fix TypeError in ec2_group.py for Python3 when sorting dictionary list
* Using json.loads() and dumps() to replace sorting
* Bug fixes for ec2_group.py
* Dictionaries cannot be compared/sorted in Python3
* Diff will occur when the IpPermissions have the same IpRanges but have different ordering
* 'before' will be sorted by 'Type' with high priority than 'IP', but 'boto3.describe_security_groups()' function cannot get 'Type' from Amazon
* Add some basic diff mode testing to exercise the rule-sorting code
